Thickness of frozen soil is an important control parameter in the process of construction using freezing method.During the construction,according to the site measured temperature data and the layout of the freezing holes,Bakholdin formula was used to calculate the thickness of frozen soil.Based on the Bakholdin formula in double-row-pipe freezing,the sensitivity analysis was conducted on the influence of the location of temperature measuring points on the frozen soil thickness in Bakholdin model.The results showed that: in the main section when temperature measuring points were arranged near the boundary of the frozen soil or at the middle of the two-row-pipe,more accurate results were obtained;The test result of the intersection section is related to that of the main section,but the calculation error is less in the intersection section.Based on the result of sensitivity analysis,in order to obtain more accurate results,the temperature measuring points should be arranged near the boundary of the frozen soil or at the middle of the two-row-pipe in the intersection section,so as to ensure the quality and safety of the construction of the project.

Hu Xiangdong1,2,Long Lianghui1,2(1.Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education,Tongji University,Shanghai 200092,China;2.School of Civil Engineering,Tongji University,Shanghai 200092,China);Freezing Reinforcement for Repair Works of Subsea Shield[J];Chinese Journal of Underground Space and Engineering;2010-03